Directional bridge coupler
a technology of directional bridges and couplers, applied in the direction of coupling devices, multiple-port networks, electrical devices, etc., can solve the problems of cumbersome switching arrangement, poor performance of proximity couplers at high operating frequencies, and poor performance of high operating frequencies
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[0011] A directional bridge coupler 20 according to the embodiments of the present invention is shown in FIG. 3. The directional bridge coupler 20 is based on the schematic diagram of a directional bridge 10 shown in FIG. 1. One commercial implementation of a directional bridge 10 is included in the model N338xA series Performance Vector Network Analyzer, from AGILENT TECHNOLOGIES, INC., Palo Alto, Calif., USA. This prior art implementation of the directional bridge has an associated performance indicated in the response plot of FIG. 2. In this response plot, isolation I between designated ports in this implementation of the directional bridge 10 steadily degrades at frequencies above approximately 5 GHz. Directivity D, an important performance parameter of the directional bridge 10 that depends on the isolation I, insertion loss L, and coupling C, correspondingly degrades at frequencies above 5 GHz.
[0012] This degraded performance at higher operating frequencies renders this prior...
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